Stocking densities of juvenile Brycon orthotaenia: production parameters and economic benefits in net cages
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Universidade Estadual de Maringá
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Developing a rearing technology requires the determination of the optimum stocking density. This study aimed to determine the best stocking density for Brycon orthotaenia juveniles grown in net cages, during the rearing phase. The research wa s conducted at the Experimental Farm of EPAMIG, in Felixlândia, Minas Gerais State, in the Três Marias Re servoir. 9,000 fingerlings we re distributed into 12 net cages, 2 m 3 each, according to a completely randomized desi gn with three replicatio ns and four different stocking densities (150, 300, 450, 600 fish m -3 ). Random samples were taken from each net cage, at the onset of the experiment and at 60 rearing days, to a ssess production parameters, specific growth rate and uniformity. We verified a positive linear relationship (p < 0.05) for final biomass (r 2 = 0.88), weight gain (r 2 = 0.87), productivity (r 2 = 0.86), apparent feed conversion (r 2 = 0.96) and economic viability (r 2 = 0.96). For survival (r 2 = 0.98), the relationship was negative (p < 0.05). There were no significant differences between treatments (p > 0.05) for growth parameters, uniformity and final weight. It can be concluded that the density of 300 fish m -3 is the most suitable, because it provides higher net revenue, survival, and a good feed conversion.
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